15 



and also at a more distant locality at the Square Water Hole, on 

 the road to Willunga, about 20 chains N.N.W. of the Old Square 

 Water Hole House, and tive to six chains from the Adelaide 

 road on the left hand side goin^ north. The surface of the stone 

 at the latter place, he states, has been loosened by vv^eathering, 

 and is more or less covered by blown sand. 



It seems highly probable that the extensive deposits of Newer 

 Tertiary sand beds, which have to a great extent choked the 

 Hindmarsh Valley, have been derived as rearranged material 

 from the glacial sandstones, which at several points are seen to 

 underlie them. 



The Hindmarsh Valley proper comes to an abrupt termination 

 at Nettle's Hill, about nine miles from Port Victor. After 

 passing Mount Billy Bridge, the road makes ;i steep ascent of 

 several hundred feet, and enters on a hilly plateau known as the 

 " Hindmarsh Tiers." I saw no granite boulders, nor could I hear 

 of any having been noticed in these Ranges. On the hilltops 

 there frequently occur, however, beds of sandy clay, in which 

 pebbles are promiscuously distributed. These pebbles are much 

 worn, and in some examples appear to be facetted. They are, 

 indeed, exactly similar to the rounded and facetted pebbles which 

 occur plentifully in undoubted glacial drift at Yankalilla and 

 Cape Jervis. I am by no means certain that they have any con- 

 nection with the glacial phenomena of the district, but their 

 occurrence is peculiar and worth recording. Similar bads with 

 pebbles distributed irregularly through them can be seen at 

 Myponga on the southern flanks of Sellick's Hill. 



At the head of the Hindmarsh River there occurs a very re- 

 markable fossiliferous limestone of Eocene age. The stone con- 

 sists almost entirely of organic remains, forming a very pure 

 carbonate of lime often of a delicate pink colour, and is quarried 

 in the neighbourhood and burnt for lime. The outcrop, which is 

 of an inconspicuous character, is confined to the sides of a narrow 

 ereek on land farmed by Mr. Geo. Maslin, within Sections 600 

 and 601, Hundred of Encounter Bay. The rock is in places 

 massive, and is exposed to a height of twenty feet above the level 

 of the stream, but as the stream has not cut its way to the base 

 of the formation its thickness is unknown. The same limestone 

 can also be seen in a small tributary a little further to the west, 

 but I did not visit the place. This limestone has been generally 

 spoken of as the " Mount Jagged limestone," but it is situated 

 more than three miles from Mount Jagged and is nearer Mount 

 Cone, which is a more considerable elevation. The spot where it 

 occurs ik marked by several strong springs which form the head- 

 waters of the Hindmarsh River. 



